LeetCode

Collection of LeetCode questions to ace the coding interview! - Created using LeetHub v2

Two Pointers

0075-sort-colors
0344-reverse-string
2572-append-characters-to-string-to-make-subsequence

String

0344-reverse-string
2572-append-characters-to-string-to-make-subsequence

Greedy

2572-append-characters-to-string-to-make-subsequence

Array

0075-sort-colors

Sorting

0075-sort-colors

LeetCode Topics

Hash Table

0041-first-missing-positive
0264-ugly-number-ii
0423-reconstruct-original-digits-from-english
0432-all-oone-data-structure
0567-permutation-in-string
0726-number-of-atoms
0870-magic-squares-in-grid
0906-walking-robot-simulation
0920-uncommon-words-from-two-sentences
0984-most-stones-removed-with-same-row-or-column
0999-regions-cut-by-slashes
1256-rank-transform-of-an-array
1473-find-the-longest-substring-containing-vowels-in-even-counts
1556-make-two-arrays-equal-by-reversing-subarrays
1620-check-if-array-pairs-are-divisible-by-k
1694-make-sum-divisible-by-p
1715-split-a-string-into-the-max-number-of-unique-substrings
1786-count-the-number-of-consistent-strings
2054-the-number-of-the-smallest-unoccupied-chair
2163-kth-distinct-string-in-an-array
2356-largest-combination-with-bitwise-and-greater-than-zero
2581-divide-players-into-teams-of-equal-skill
2586-longest-square-streak-in-an-array
2677-cousins-in-binary-tree-ii
2755-extra-characters-in-a-string
3276-minimum-number-of-pushes-to-type-word-ii
3329-find-the-length-of-the-longest-common-prefix
3501-delete-nodes-from-linked-list-present-in-array

String

0179-largest-number
0214-shortest-palindrome
0241-different-ways-to-add-parentheses
0273-integer-to-english-words
0423-reconstruct-original-digits-from-english
0539-minimum-time-difference
0564-find-the-closest-palindrome
0567-permutation-in-string
0592-fraction-addition-and-subtraction
0664-strange-printer
0726-number-of-atoms
0812-rotate-string
0920-uncommon-words-from-two-sentences
0957-minimum-add-to-make-parentheses-valid
1197-parsing-a-boolean-expression
1302-delete-characters-to-make-fancy-string
1304-longest-happy-string
1350-remove-sub-folders-from-the-filesystem
1473-find-the-longest-substring-containing-vowels-in-even-counts
1667-find-kth-bit-in-nth-binary-string
1715-split-a-string-into-the-max-number-of-unique-substrings
1786-count-the-number-of-consistent-strings
1923-sentence-similarity-iii
1967-longest-substring-of-all-vowels-in-order
2076-sum-of-digits-of-string-after-convert
2095-minimum-number-of-swaps-to-make-the-string-balanced
2163-kth-distinct-string-in-an-array
2494-sum-of-prefix-scores-of-strings
2580-circular-sentence
2755-extra-characters-in-a-string
2800-minimum-string-length-after-removing-substrings
3174-minimum-number-of-changes-to-make-binary-string-beautiful
3195-separate-black-and-white-balls
3235-minimum-cost-to-convert-string-i
3276-minimum-number-of-pushes-to-type-word-ii
3329-find-the-length-of-the-longest-common-prefix
3451-string-compression-iii

Stack

0145-binary-tree-postorder-traversal
0726-number-of-atoms
0776-n-ary-tree-postorder-traversal
0957-minimum-add-to-make-parentheses-valid
1002-maximum-width-ramp
1197-parsing-a-boolean-expression
1497-design-a-stack-with-increment-operation
1679-shortest-subarray-to-be-removed-to-make-array-sorted
2095-minimum-number-of-swaps-to-make-the-string-balanced
2800-minimum-string-length-after-removing-substrings

Sorting

0179-largest-number
0539-minimum-time-difference
0719-find-k-th-smallest-pair-distance
0726-number-of-atoms
1256-rank-transform-of-an-array
1556-make-two-arrays-equal-by-reversing-subarrays
1615-range-sum-of-sorted-subarray-sums
2179-most-beautiful-item-for-each-query
2488-divide-intervals-into-minimum-number-of-groups
2554-minimum-total-distance-traveled
2581-divide-players-into-teams-of-equal-skill
2586-longest-square-streak-in-an-array
2646-kth-largest-sum-in-a-binary-tree
2699-count-the-number-of-fair-pairs
3276-minimum-number-of-pushes-to-type-word-ii
3291-find-if-array-can-be-sorted

Array

0040-combination-sum-ii
0041-first-missing-positive
0059-spiral-matrix-ii
0179-largest-number
0539-minimum-time-difference
0624-maximum-distance-in-arrays
0719-find-k-th-smallest-pair-distance
0729-my-calendar-i
0731-my-calendar-ii
0859-design-circular-deque
0870-magic-squares-in-grid
0890-lemonade-change
0892-shortest-subarray-with-sum-at-least-k
0906-walking-robot-simulation
0921-spiral-matrix-iii
0999-regions-cut-by-slashes
1002-maximum-width-ramp
1240-stone-game-ii
1256-rank-transform-of-an-array
1325-path-with-maximum-probability
1350-remove-sub-folders-from-the-filesystem
1402-count-square-submatrices-with-all-ones
1435-xor-queries-of-a-subarray
1497-design-a-stack-with-increment-operation
1556-make-two-arrays-equal-by-reversing-subarrays
1615-range-sum-of-sorted-subarray-sums
1620-check-if-array-pairs-are-divisible-by-k
1679-shortest-subarray-to-be-removed-to-make-array-sorted
1691-minimum-number-of-days-to-disconnect-island
1694-make-sum-divisible-by-p
1711-find-valid-matrix-given-row-and-column-sums
1755-defuse-the-bomb
1766-minimum-number-of-removals-to-make-mountain-array
1786-count-the-number-of-consistent-strings
1923-sentence-similarity-iii
1940-maximum-xor-for-each-query
2006-find-the-student-that-will-replace-the-chalk
2035-count-sub-islands
2054-the-number-of-the-smallest-unoccupied-chair
2067-maximum-number-of-points-with-cost
2132-convert-1d-array-into-2d-array
2155-find-missing-observations
2163-kth-distinct-string-in-an-array
2170-count-number-of-maximum-bitwise-or-subsets
2179-most-beautiful-item-for-each-query
2188-minimized-maximum-of-products-distributed-to-any-store
2356-largest-combination-with-bitwise-and-greater-than-zero
2411-spiral-matrix-iv
2472-build-a-matrix-with-conditions
2488-divide-intervals-into-minimum-number-of-groups
2494-sum-of-prefix-scores-of-strings
2503-longest-subarray-with-maximum-bitwise-and
2545-height-of-binary-tree-after-subtree-removal-queries
2554-minimum-total-distance-traveled
2581-divide-players-into-teams-of-equal-skill
2586-longest-square-streak-in-an-array
2616-maximal-score-after-applying-k-operations
2699-count-the-number-of-fair-pairs
2716-prime-subtraction-operation
2755-extra-characters-in-a-string
2794-maximum-number-of-moves-in-a-grid
3235-minimum-cost-to-convert-string-i
3291-find-if-array-can-be-sorted
3329-find-the-length-of-the-longest-common-prefix
3380-shortest-subarray-with-or-at-least-k-ii
3501-delete-nodes-from-linked-list-present-in-array

Greedy

0179-largest-number
0624-maximum-distance-in-arrays
0670-maximum-swap
0890-lemonade-change
0957-minimum-add-to-make-parentheses-valid
1304-longest-happy-string
1711-find-valid-matrix-given-row-and-column-sums
1766-minimum-number-of-removals-to-make-mountain-array
2095-minimum-number-of-swaps-to-make-the-string-balanced
2488-divide-intervals-into-minimum-number-of-groups
2616-maximal-score-after-applying-k-operations
2716-prime-subtraction-operation
3195-separate-black-and-white-balls
3276-minimum-number-of-pushes-to-type-word-ii

Matrix

0059-spiral-matrix-ii
0870-magic-squares-in-grid
0921-spiral-matrix-iii
0999-regions-cut-by-slashes
1402-count-square-submatrices-with-all-ones
1691-minimum-number-of-days-to-disconnect-island
1711-find-valid-matrix-given-row-and-column-sums
2035-count-sub-islands
2132-convert-1d-array-into-2d-array
2411-spiral-matrix-iv
2472-build-a-matrix-with-conditions
2794-maximum-number-of-moves-in-a-grid

Graph

0984-most-stones-removed-with-same-row-or-column
1325-path-with-maximum-probability
2472-build-a-matrix-with-conditions
2803-modify-graph-edge-weights
3235-minimum-cost-to-convert-string-i

Topological Sort

2472-build-a-matrix-with-conditions

Shortest Path

1325-path-with-maximum-probability
2803-modify-graph-edge-weights
3235-minimum-cost-to-convert-string-i

Two Pointers

0567-permutation-in-string
0719-find-k-th-smallest-pair-distance
1615-range-sum-of-sorted-subarray-sums
1679-shortest-subarray-to-be-removed-to-make-array-sorted
1923-sentence-similarity-iii
2095-minimum-number-of-swaps-to-make-the-string-balanced
2488-divide-intervals-into-minimum-number-of-groups
2581-divide-players-into-teams-of-equal-skill
2699-count-the-number-of-fair-pairs
3195-separate-black-and-white-balls

Binary Search

0719-find-k-th-smallest-pair-distance
0729-my-calendar-i
0731-my-calendar-ii
0892-shortest-subarray-with-sum-at-least-k
1615-range-sum-of-sorted-subarray-sums
1679-shortest-subarray-to-be-removed-to-make-array-sorted
1766-minimum-number-of-removals-to-make-mountain-array
2006-find-the-student-that-will-replace-the-chalk
2179-most-beautiful-item-for-each-query
2188-minimized-maximum-of-products-distributed-to-any-store
2586-longest-square-streak-in-an-array
2699-count-the-number-of-fair-pairs
2716-prime-subtraction-operation

Counting

0920-uncommon-words-from-two-sentences
1620-check-if-array-pairs-are-divisible-by-k
1786-count-the-number-of-consistent-strings
2163-kth-distinct-string-in-an-array
2356-largest-combination-with-bitwise-and-greater-than-zero
2494-sum-of-prefix-scores-of-strings
3276-minimum-number-of-pushes-to-type-word-ii

Math

0241-different-ways-to-add-parentheses
0264-ugly-number-ii
0273-integer-to-english-words
0423-reconstruct-original-digits-from-english
0539-minimum-time-difference
0564-find-the-closest-palindrome
0592-fraction-addition-and-subtraction
0650-2-keys-keyboard
0670-maximum-swap
0870-magic-squares-in-grid
1240-stone-game-ii
2155-find-missing-observations
2716-prime-subtraction-operation
2903-insert-greatest-common-divisors-in-linked-list

Recursion

0241-different-ways-to-add-parentheses
0273-integer-to-english-words
1197-parsing-a-boolean-expression
1667-find-kth-bit-in-nth-binary-string

Simulation

0059-spiral-matrix-ii
0592-fraction-addition-and-subtraction
0906-walking-robot-simulation
0921-spiral-matrix-iii
1667-find-kth-bit-in-nth-binary-string
2006-find-the-student-that-will-replace-the-chalk
2076-sum-of-digits-of-string-after-convert
2132-convert-1d-array-into-2d-array
2155-find-missing-observations
2411-spiral-matrix-iv
2800-minimum-string-length-after-removing-substrings

Depth-First Search

0145-binary-tree-postorder-traversal
0386-lexicographical-numbers
0776-n-ary-tree-postorder-traversal
0984-most-stones-removed-with-same-row-or-column
0988-flip-equivalent-binary-trees
0999-regions-cut-by-slashes
1350-remove-sub-folders-from-the-filesystem
1484-linked-list-in-binary-tree
1691-minimum-number-of-days-to-disconnect-island
2035-count-sub-islands
2545-height-of-binary-tree-after-subtree-removal-queries
2677-cousins-in-binary-tree-ii

Breadth-First Search

0999-regions-cut-by-slashes
1484-linked-list-in-binary-tree
1691-minimum-number-of-days-to-disconnect-island
2035-count-sub-islands
2545-height-of-binary-tree-after-subtree-removal-queries
2646-kth-largest-sum-in-a-binary-tree
2677-cousins-in-binary-tree-ii

Union Find

0984-most-stones-removed-with-same-row-or-column
0999-regions-cut-by-slashes
2035-count-sub-islands

Tree

0145-binary-tree-postorder-traversal
0776-n-ary-tree-postorder-traversal
0789-kth-largest-element-in-a-stream
0988-flip-equivalent-binary-trees
1484-linked-list-in-binary-tree
2545-height-of-binary-tree-after-subtree-removal-queries
2646-kth-largest-sum-in-a-binary-tree
2677-cousins-in-binary-tree-ii

Design

0432-all-oone-data-structure
0729-my-calendar-i
0731-my-calendar-ii
0789-kth-largest-element-in-a-stream
0859-design-circular-deque
1497-design-a-stack-with-increment-operation

Binary Search Tree

0789-kth-largest-element-in-a-stream

Heap (Priority Queue)

0264-ugly-number-ii
0789-kth-largest-element-in-a-stream
0892-shortest-subarray-with-sum-at-least-k
1304-longest-happy-string
1325-path-with-maximum-probability
2054-the-number-of-the-smallest-unoccupied-chair
2488-divide-intervals-into-minimum-number-of-groups
2616-maximal-score-after-applying-k-operations
2803-modify-graph-edge-weights

Binary Tree

0145-binary-tree-postorder-traversal
0789-kth-largest-element-in-a-stream
0988-flip-equivalent-binary-trees
1484-linked-list-in-binary-tree
2545-height-of-binary-tree-after-subtree-removal-queries
2646-kth-largest-sum-in-a-binary-tree
2677-cousins-in-binary-tree-ii

Data Stream

0789-kth-largest-element-in-a-stream

Strongly Connected Component

1691-minimum-number-of-days-to-disconnect-island

Backtracking

0040-combination-sum-ii
1715-split-a-string-into-the-max-number-of-unique-substrings
2170-count-number-of-maximum-bitwise-or-subsets

Sliding Window

0567-permutation-in-string
0892-shortest-subarray-with-sum-at-least-k
1755-defuse-the-bomb
1967-longest-substring-of-all-vowels-in-order
3380-shortest-subarray-with-or-at-least-k-ii

Dynamic Programming

0241-different-ways-to-add-parentheses
0264-ugly-number-ii
0650-2-keys-keyboard
0664-strange-printer
1240-stone-game-ii
1402-count-square-submatrices-with-all-ones
1766-minimum-number-of-removals-to-make-mountain-array
2067-maximum-number-of-points-with-cost
2554-minimum-total-distance-traveled
2586-longest-square-streak-in-an-array
2755-extra-characters-in-a-string
2794-maximum-number-of-moves-in-a-grid

Database

0176-second-highest-salary
0178-rank-scores
0182-duplicate-emails
0183-customers-who-never-order
0586-customer-placing-the-largest-number-of-orders
1268-market-analysis-i
1278-product-price-at-a-given-date
1292-immediate-food-delivery-ii
2057-count-salary-categories
2087-confirmation-rate

Prefix Sum

0731-my-calendar-ii
0892-shortest-subarray-with-sum-at-least-k
1240-stone-game-ii
1435-xor-queries-of-a-subarray
1473-find-the-longest-substring-containing-vowels-in-even-counts
1694-make-sum-divisible-by-p
1940-maximum-xor-for-each-query
2006-find-the-student-that-will-replace-the-chalk
2488-divide-intervals-into-minimum-number-of-groups

Game Theory

1240-stone-game-ii

Bit Manipulation

0476-number-complement
1435-xor-queries-of-a-subarray
1473-find-the-longest-substring-containing-vowels-in-even-counts
1786-count-the-number-of-consistent-strings
1940-maximum-xor-for-each-query
2170-count-number-of-maximum-bitwise-or-subsets
2323-minimum-bit-flips-to-convert-number
2356-largest-combination-with-bitwise-and-greater-than-zero
2503-longest-subarray-with-maximum-bitwise-and
3291-find-if-array-can-be-sorted
3380-shortest-subarray-with-or-at-least-k-ii
3394-minimum-array-end

Linked List

0432-all-oone-data-structure
0725-split-linked-list-in-parts
0859-design-circular-deque
1484-linked-list-in-binary-tree
2411-spiral-matrix-iv
2903-insert-greatest-common-divisors-in-linked-list
3501-delete-nodes-from-linked-list-present-in-array

Number Theory

2716-prime-subtraction-operation
2903-insert-greatest-common-divisors-in-linked-list

Brainteaser

2503-longest-subarray-with-maximum-bitwise-and

Memoization

0241-different-ways-to-add-parentheses

Rolling Hash

0214-shortest-palindrome

String Matching

0214-shortest-palindrome
0812-rotate-string

Hash Function

0214-shortest-palindrome

Trie

0386-lexicographical-numbers
0440-k-th-smallest-in-lexicographical-order
1350-remove-sub-folders-from-the-filesystem
2494-sum-of-prefix-scores-of-strings
2755-extra-characters-in-a-string
3329-find-the-length-of-the-longest-common-prefix

Segment Tree

0729-my-calendar-i
0731-my-calendar-ii

Ordered Set

0729-my-calendar-i
0731-my-calendar-ii

Queue

0859-design-circular-deque
0892-shortest-subarray-with-sum-at-least-k

Doubly-Linked List

0432-all-oone-data-structure

Monotonic Stack

1002-maximum-width-ramp
1679-shortest-subarray-to-be-removed-to-make-array-sorted

Enumeration

2170-count-number-of-maximum-bitwise-or-subsets

Monotonic Queue

0892-shortest-subarray-with-sum-at-least-k